Metso's feeder has a dual-helix design which can produce fast, high-volume filling and accurate dribble flow at the end of the cycle. It has a compact design which is suitable for applications where limited space prohibits multiple individual screw units. 

The BEST Model TSF has two helixes, 1½ inches and 4 inches in diameter, mounted on an 18 inches x 22 inches hopper. They are rated at 17 ft3 and 283 ft3 per hour, respectively, at maximum RPM with 100%-efficient conveyable product and no slippage. The feeder is suitable for batching to weigh-hoppers, low loss-in-weight scale-monitored flow, low loss-of-weight batch applications with scales, drum and pail packout lines and recipe-type batching by multiple computer-controlled units.